7TUG | pdb_00007tug

Crystal structure of Tapasin in complex with PaSta2-Fab

External Resource: Annotation

Domain Annotation: ECOD Classification
Domain Annotation: CATH
SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
C [auth L]	prok_STING	e7tugL1	A: alpha bundles	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: prok_STING	ECOD (develop294)
B [auth H]	prok_STING	e7tugH1	A: alpha bundles	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: prok_STING	ECOD (develop294)
A [auth D]	prok_STING	e7tugD1	A: alpha bundles	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: prok_STING	ECOD (develop294)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
C [auth L]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
B [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
A [auth D]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
C [auth L]	Light Chain	IGKV8	Kappa	tapasin	SAbDab (2026-03-20)
B [auth H]	Heavy Chain	IGHV1	-	tapasin	SAbDab (2026-03-20)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A [auth D]	PF07654	Immunoglobulin C1-set domain (C1-set)	Immunoglobulin C1-set domain		Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C [auth L]	PaSta2 Fab kappa light chain	-	-	-
B [auth H]	PaSta2 Fab heavy chain	-	-	-
A [auth D]	Tapasin	binding antigen binding peptide antigen binding peptide binding protein-containing complex binding MHC protein complex binding MHC class I protein complex binding TAP1 binding TAP binding protein binding unfolded protein binding TAP complex binding molecular adaptor activity MHC class I protein binding binding antigen binding peptide antigen binding peptide binding protein-containing complex binding MHC protein complex binding MHC class I protein complex binding TAP1 binding TAP binding protein binding unfolded protein binding TAP complex binding molecular adaptor activity MHC class I protein binding signaling receptor binding MHC protein binding protein folding chaperone TAP2 binding	cellular component organization cellular component biogenesis cellular component assembly protein-containing complex organization protein-containing complex assembly cellular process cellular component organization or biogenesis antigen processing and presentation immune system process antigen processing and presentation of exogenous peptide antigen via MHC class I, TAP-dependent antigen processing and presentation of peptide antigen via MHC class I antigen processing and presentation of exogenous peptide antigen via MHC class I antigen processing and presentation of exogenous peptide antigen antigen processing and presentation of peptide antigen cellular component organization cellular component biogenesis cellular component assembly protein-containing complex organization protein-containing complex assembly cellular process cellular component organization or biogenesis antigen processing and presentation immune system process antigen processing and presentation of exogenous peptide antigen via MHC class I, TAP-dependent antigen processing and presentation of peptide antigen via MHC class I antigen processing and presentation of exogenous peptide antigen via MHC class I antigen processing and presentation of exogenous peptide antigen antigen processing and presentation of peptide antigen antigen processing and presentation of exogenous antigen regulation of protein complex stability biological regulation regulation of biological quality regulation of biosynthetic process regulation of biological process regulation of cellular process regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process regulation of gene expression biosynthetic process regulation of macromolecule biosynthetic process metabolic process macromolecule metabolic process regulation of metabolic process localization transport retrograde vesicle-mediated transport, Golgi to endoplasmic reticulum establishment of localization Golgi vesicle transport vesicle-mediated transport peptide stabilization peptide antigen stabilization peptide metabolic process antigen processing and presentation of endogenous peptide antigen antigen processing and presentation of endogenous antigen antigen processing and presentation of endogenous peptide antigen via MHC class I peptide antigen assembly with MHC class I protein complex peptide antigen assembly with MHC protein complex MHC class I protein complex assembly MHC protein complex assembly MHC class Ib protein complex assembly	membrane-bounded organelle intracellular anatomical structure organelle subcompartment membrane intracellular membrane-bounded organelle endomembrane system endoplasmic reticulum subcompartment intracellular organelle cellular anatomical structure organelle nuclear outer membrane-endoplasmic reticulum membrane network endoplasmic reticulum cytoplasm organelle membrane membrane-bounded organelle intracellular anatomical structure organelle subcompartment membrane intracellular membrane-bounded organelle endomembrane system endoplasmic reticulum subcompartment intracellular organelle cellular anatomical structure organelle nuclear outer membrane-endoplasmic reticulum membrane network endoplasmic reticulum cytoplasm organelle membrane endoplasmic reticulum membrane protein-containing complex MHC class I peptide loading complex Tapasin-ERp57 complex membrane protein complex endoplasmic reticulum protein-containing complex lumenal side of endoplasmic reticulum membrane side of membrane lumenal side of membrane intracellular vesicle phagocytic vesicle phagocytic vesicle membrane cytoplasmic vesicle membrane bounding membrane of organelle cytoplasmic vesicle vesicle membrane endocytic vesicle membrane vesicle endocytic vesicle Golgi membrane Golgi apparatus endoplasmic reticulum-Golgi intermediate compartment membrane endoplasmic reticulum-Golgi intermediate compartment

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A [auth D]	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
A [auth D]	IPR003597	Immunoglobulin C1-set	Domain
A [auth D]	IPR008056	Tapasin	Family
A [auth D]	IPR050380	Immune Recognition and Response Modulators	Family
A [auth D]	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
A [auth D]	IPR007110	Immunoglobulin-like domain	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A [auth D]	Pharos: O15533	MHC class I deficiency acute myeloid leukemia Bare Lymphocyte Syndrome, Type I endogenous depression juvenile dermatomyositis ovarian cancer schizophrenia astrocytic tumor cervical cancer esophageal adenocarcinoma lung cancer oligodendroglioma pancreatic intraductal papillary-mucinous carcinoma triple-negative breast carcinoma atopic eczema MHC class I deficiency acute myeloid leukemia Bare Lymphocyte Syndrome, Type I endogenous depression juvenile dermatomyositis ovarian cancer schizophrenia astrocytic tumor cervical cancer esophageal adenocarcinoma lung cancer oligodendroglioma pancreatic intraductal papillary-mucinous carcinoma triple-negative breast carcinoma atopic eczema chronic obstructive pulmonary disease glioblastoma malignant ependymoma osteosarcoma psoriasis

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.